linux-kernel - Re: [PATCH] ARC: return -EFAULT on failed access_ok for arc_usr

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Date:   Mon, 24 Oct 2016 16:58:43 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-snps-arc@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARC: return -EFAULT on failed access_ok for
 arc_usr_cmpxchg syscall

On 24/10/16 16:56, Vineet Gupta wrote:
> On 10/24/2016 03:47 AM, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> arc_usr_cmpxchg currently returns an uninitialized value in ret
>> on a failed access_ok call. Instead, return -EFAULT.
>>
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  arch/arc/kernel/process.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
>> index a746008..9ae3e1c 100644
>> --- a/arch/arc/kernel/process.c
>> +++ b/arch/arc/kernel/process.c
>> @@ -47,7 +47,7 @@ SYSCALL_DEFINE3(arc_usr_cmpxchg, int *, uaddr, int, expected, int, new)
>>  	int ret;
>>  
>>  	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
>> -		return ret;
>> +		return -EFAULT;
>>  
>>  	preempt_disable();
> 
> Thx for spotting this. Since this is new code, not yet merged, do you mind if I
> squash it with orig patch. I can add a Reviewed-by a SOB as you prefer.

Sure, squash it int and add me as a Reviewed-by.

Colin
> 
> Thx,
> -Vineet
> 
>